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What should I check if my 2020 Toyota Highlander's engine is making a knocking noise? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What should I check if my 2020 Toyota Highlander's engine is making a knocking noise?

What should I check if my 2020 Toyota Highlander's engine is making a knocking noise?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
583 words

Problem Statement

Learn how to diagnose and repair knocking noises in your 2020 Toyota Highlander engine with our step-by-step guide.

Affected Component
engine

Symptoms

  • •Knocking Noise
  • •Loss of Power
  • •Check Engine Light
  • •Rough Idling

Diagnostic Steps

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Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II Scanner
  • •Torque wrench
  • •Socket set (metric)
  • •Screwdrivers (flathead and Phillips)
  • •Engine oil dipstick
  • •Stethoscope or mechanic's stethoscope
  • •Flashlight
  • •Safety glasses
  • •Repair manual for specific torque specifications and procedures

Additional Information

Affected Component
engine
Difficulty
medium
Severity
medium
Tools Required
9 items

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Back to Generation

If your 2020 Toyota Highlander is making a knocking noise from the engine, it is crucial to diagnose the issue accurately to prevent potential damage. Below are the symptoms, diagnostic steps, tools required, and repair instructions.

Tools Required
  • OBD-II Scanner
  • Torque wrench
  • Socket set (metric)
  • Screwdrivers (flathead and Phillips)
  • Engine oil dipstick
  • Stethoscope or mechanic's stethoscope
  • Flashlight
  • Safety glasses
  • Repair manual for specific torque specifications and procedures
Repair Instructions

  1. Perform Engine Oil Change (if necessary):

    • If the oil is dirty or low, change the oil and filter.
    • Use the recommended oil grade as per the owner’s manual.

  2. Replace Spark Plugs:

    • Remove the ignition coils using a socket and ratchet.
    • Unscrew the spark plugs with a spark plug socket.
    • Inspect and replace old spark plugs with new ones as necessary.
    • Reinstall the ignition coils.

  3. Inspect and Tighten Components:

    • Using a torque wrench, ensure all engine components are properly tightened.
    • Pay attention to the exhaust manifold and heat shields that can cause knocking sounds.

  4. Timing Chain/Belt Replacement (if necessary):

    • If the timing chain/belt is worn or misaligned, refer to the service manual for replacement instructions.
    • This is a more complex procedure that might require professional assistance.

  5. Fuel System Cleaning:

    • If poor fuel quality is suspected, consider using a fuel system cleaner or running a tank of high-octane fuel.

  6. Testing:

    • After performing repairs, start the engine to determine if the knocking noise persists.
    • Take the vehicle for a short test drive to confirm that the issue is resolved.
Conclusion

If after these diagnostic steps and repairs the knocking noise persists, it could indicate a more serious internal engine issue, such as rod knock or bearing failure. At this point, it’s advisable to seek professional assistance from a qualified mechanic or Toyota dealership for further diagnosis and repair.